Heidelberg 2007 – scientific programme

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T: Fachverband Teilchenphysik

T 315: Halbleiterdetektoren II

T 315.7: Talk

Wednesday, March 7, 2007, 18:15–18:30, INF 306 SR 14

Optical Crosstalk, a Nuisance when operating SiPM? — •Nepomuk Otte — Max-Planck-Institut für Physik, München

Optical crosstalk is a feature of SiPM, a novel semiconductor photon-detector. SiPMs are composed of a matrix of avalanche photodiodes (cells) of which each diode is operating in the limited Geiger mode. If a photon is detected in one of the cells a breakdown of the corresponding diode is initiated. In the course of the breakdown photons are generated which propagate within the SiPM and eventually “fire” other cells (optical crosstalk).

By means of Monte Carlo simulations I studied the effect of optical crosstalk in SiPM. It was possible to quantify the energy and intensity of the photons which are responsible for optical crosstalk by comparing results from the simulations with measurements. Moreover I give predictions for the optical crosstalk behavior in back side illuminated SiPM and discuss the resultant consequences for operation of these sensors. Back side illuminated SiPM are particulary susceptible to optical crosstalk as basically the full detector volume is sensitive to photons.